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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d2755e5ab0293de3a61c0ce9fae9a7b972ecd9dbf3c9b2b6b2c40613008d859' 
  AND token = 'BIVkRO7RcGNuSBEmL965roNQfLKRLINjXy+W18d82mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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