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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073d31c785589cc3f072fe5761119f7d34fcc26af91d51e5e3e7f56d501d5cc7' 
  AND token = 'JxtY3CY1kwh4cCaaRUIg5bU9HnhvuXeCF5L7yYnXJrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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