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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca857b7af9e3378ac6b33aaa3211b8afc168d49b4d7ddeedfa22044af49920b' 
  AND token = '3PdRbi7Mp0n4ufEvrRC9QdM2X+ce3pZXDKmHTn/Dzek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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