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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea8dce6a2380ec8c41662c1a077fee8cf87f2cc6f0aec30051af201d07e7c49' 
  AND token = 'xFzQoktLPNCCgVF2Ho3Rpzq9pECDcZVUGBp2K/em8pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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