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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c79818ec8cecec8d7993a958526616b61804ac39f29eebf1c2ee6e19b634daf2' 
  AND token = 'JzCXGOGnSP6p5jpo3KGat6kiOiP6IE2P6mvu5si+gSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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