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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '941ec5fa480a028c65ef2d3d3ccc10e2c11272c29ed0411d140eb6fa7287c874' 
  AND token = 'cn7aD5mLY/NDkCFdKBtE4Oo/pH6peFXDv07dKIIFyD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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