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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6488ab2e34ad6b947830a8988a2b245da078aa87fc3f97e9b56dcb844b8ad813' 
  AND token = 'aMhR2lc5GoFBPsfS9MzPhjHitLuncWCSO8fAET45KBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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