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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d229570f07b11a01eed9be690608e94e5f1ac74632cc882f4f3c6ecc852f46' 
  AND token = 'lPjUVYL0+Hgs6tCLRAWnZLF+SGDVQacEEN+85H4x8JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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