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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f73d4134c567feba95ce981fa8bcb3daa070f3e796c24960da93ab2afd966ec4' 
  AND token = '5xzqzJ4f2Uzm91lGME21VzmDQ30b+kEvuSwIw1Kkn2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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