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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd3508ec3dbc80b987c88083d65945eff6b7f7831f54ac0ed688e9a867764fe' 
  AND token = 'gFetdaVz8iEKbjSLBSkNkLKNUtD7uVNjpPva8GEcTho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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