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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d0fe84de5d83f402187890480d04911a8e4b46cadddbda0e9d4fbe7ce76d9b' 
  AND token = 'avwZCiBnsvYbMz/flTNZC3FW6hEVLZdUFiRuY4fnSos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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