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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c93b95fe45c78d2ba61525a0d611272c9775d6c664cd98b4e7016f2eb1b012c' 
  AND token = 'GGfJ0c7z81hJkuQnORqqS/oGucMEajg9mRJ/nxjK7iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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