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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c90e2bc091d43bcfe838689cc20e09b9c99e46cc1fae2ec49f75a0255bd4e2d' 
  AND token = 'ckkb8KEzvOzRtvdJUgzhiZk0y2GYTV+SIpv0rLGEg1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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