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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571f30153c2a144b25919e90c5a684fe5446b235e17c6245fa35c3b1037efb5d' 
  AND token = 'Pd6qhFiX69LVtWXOpWVM7LyNKKA0+AVEfZviyGqaZ+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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