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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd65a087770c0c0ce19e595f157761178c8656f838d67cfd3ee02b867d3e7fb75' 
  AND token = 'PBlon/YHy3eevRXW/P74YE2gtsPfm14v2fyYdmBGV9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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