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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40efab47172e5bff1a11f1af05d3926392b96e975fc1047c91fa07faab3dea8' 
  AND token = 'VJ00GW/R/pob4RxEvifwkXXjY/xYaBjg0hIkU9zFTq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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