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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc1937a683e90c5476ae74a5ae26ab1824040b0f230c39e323377797e6e22a3' 
  AND token = 'NNATQt0PhTZz1rTK8MD9T/yvxiyaFu8Zrpzw01HZyj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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