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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f346876d8082e362fc0ceba1f4bdfe3d1a04c24714363e74690c0ba5596a877' 
  AND token = 'weimq5/xJuS9E5R6Kqx34Ld3wwEjZUi9npKgDJSW/L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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