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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8d12bb8c049f6a440d0e01c381514125806cd6a18979ddbd5b7c05c9e86c42' 
  AND token = 'GDUxEG9cECOqlf2jn08Bj1fSx3XYvAoY77MN8zq+mqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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