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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf19ee976c3b4840c2da7b6d89c52624751eaf193efe20ae6c2c82c02be3fd3' 
  AND token = '9LAgAeT9WHJZDmFcbgP2PFSuToVsGpJhXCc1mGFhfBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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