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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15e965c56b083f0ae13f1c32b981cfe419c6888a17fe376459fd3bca8e0c63d' 
  AND token = 'FPIm5XScfpXh9nkwIKWblwrl3a4GocmK/7etAs2UM30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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