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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a447b8514d0d79f1178d7b1db1810d65d395060f826bafb5dc462e262fa88a83' 
  AND token = 'TJXXP42t0K444Bzqp9TZTQu/6I8O+Gde+pRI/rbP/6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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