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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd32c048dd167ccf746e898e35ae90ab8c8affddc2c88a1d01d0ce3b7a9d5124' 
  AND token = 'T2Q1oqrK1I3YkR5M8lju/DEFoUCtNubNO3AVG1gQFBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00218

JSON explain

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