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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31398bc6a4430f6b5af3c40860876e1d372b1133a8f8fe049a7649c41c393438' 
  AND token = 'RUoFsHKIeDdwLshse+2kKR/NcOH+DzOwxi1h8a71tZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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