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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd343df667eb36cacd92211c7a2d7256c9fbcfafec12d7d57a6aecaee4516384c' 
  AND token = 'kkxagIghg4DiCr7ldgVr8nVZt1KSUna9H2jn4v/IP78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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