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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46a92ff68a9edc0c40b5ec3202e4308ce5a08fc29b1ad217c25aca5455d5c4c' 
  AND token = 'dt6bE7Ar2tA15xxeZNyIazJleM9MBuSSe1tgpyzdM5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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