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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2462e6169df084b7115a10152f2df37c01df0a884d4090e64b4548df77a8f1' 
  AND token = 'CyW+n52bYRAjNVFdWO0e/pRs/YM8NGsuCAQ8Hzs+N0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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