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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c98c83acd6a3ea9bc1fe33f3b4576acec11ba2b0d5100bb3f409f1aade304ad' 
  AND token = 'S/z/XG0z/r8VUS2fHmXO5ezLOaL+KS0o68i/juX1FP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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