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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce539356fa6d69f116bcfc8d44285144f8b780b7d5c6822ba8130d5fab30c764' 
  AND token = 'C6JAe5x1AcayXczJky7/Cl+2L59BYE67e26qjBUyzM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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