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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441154e960d98a1ef85cbc244898238893949aeac92ae7c83b800c2551877578' 
  AND token = 'fmYTpibuC0Kjn5UHXtiEz+WOhJHb2Y3T2bPT+6YPKbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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