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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262fa70ad0b9bfacb9190a3a4f18e021965b716a82742205f402b2a27a5bf37c' 
  AND token = '43bru9u+/ESAhqURogHG/nVeR1/b8xVtU5G3sPxmRZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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