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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56cda2af781ca76f9342cd2e810faf78ac973883700b0b481b69e708cef3d641' 
  AND token = '5yH2eP++EeCGQUXfefYefEm2kfR1EPpoYFGAUwFoNn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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