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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a66aa04cff26ec687f9edd54c7adec672a94a34eff69bd0257e8b2072ffa75' 
  AND token = '1jMXb7oNZ5fzGqnbsdJfikZN/22KZ/hlwosakImdPIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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