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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6adb722d3c6d26e53179c4ce124bc9295dcc93d3591ebb3db249dd941d7e90' 
  AND token = 'g6BnVTdjkT1xT3cFoOMF5K5AuBEBCiRWN68iM86OQEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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