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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35920ad6b14bd5f746c30bae61387886b3df55578891c04c4a451b39c50fac22' 
  AND token = '+xHfRNBFMbj5reS6wYmN7DB9nWM3K65Ml+fxF5uwlt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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