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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f159f7aa3de659fe77b1c84d1512d51c1f108b1a389152b9c24f6c4fa20d5f3' 
  AND token = 'PayST8l9HN1HG0rbkq333LBrDxPShu5cX6/Osgb75Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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