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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bada1c706242390ec8c6bb5fc64f4590ec000e8cd70d274fc382aabf2149d1df' 
  AND token = 'STo46VJob+p8767LSmnw07dhs0KWzYI5NhsqZoZT6pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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