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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e16035db2feeb41bb5ec42c918b4d95c9e7439dfe574e7a29a55c149b60c1fe' 
  AND token = 'xiK2tlGwW6g/d1cYYJKikl3Z3ELSpPLc9AHuZnHr8zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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