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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bcd83f889cb4b31c4aeedc0b3619f21bb96e0ec6186ee9ec48b18e73e10bac0' 
  AND token = 'JW14YtGS3EnVboSsBQCCnL59PSOzC1og+WM1XhWx0k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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