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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b528cc46856ebd7e6216508d5b539ac5a9fa1aae2c108fce3541c281b83a7c83' 
  AND token = 'ebkIegCyIjqNB2Z5o7MszFQOFCgGn27L65dlDS1WKO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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