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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be95dc781a2c5b98feb4d69d4e34262513395561e67380519280765b36643f22' 
  AND token = 'Q8oWcwDvFoxxM4Mqa9PxuMWGoWqQIAgeQUwm4TSMAPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}