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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'befb6a5c56a47ecd3a0e5a304deba505c57d0b1478601be5dcc0c437a3f9b4ca' 
  AND token = 'CyPbuNyxYq8thPi86ZVzSQ9YfwDFZ577+5+DNB7EWhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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