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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cbaf4f343f6ea00feb3045e3cb813177fae2d0b5d04bb0530b2496c7bbcd82' 
  AND token = 'llTWQcFbPEbl8Gl0HcIgaCS+tGszdJnn4u7OYlk3Va8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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