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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77adccea906212a6c176941b45a8833fcefc4b15669ae8fb90528a697e1e904' 
  AND token = 'xc88GabBM15+6wlGey8DvRH0LZF9Np9sNqXNhM0re5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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