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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a2a8d217c0d672fb244cb613c4ae09b51315ab8877e9d39371ff616d5b47e63' 
  AND token = 'Ta3iSBD+O9doCJXekfYkEwsFR6JQxvMEgDWwQ0cM/2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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