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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41317d8c9264b5217f4e08203e82a79350b173dc5d817b67f0ab1cfa938a202e' 
  AND token = 'Fa1bkrI8yqjllTFihTK6pbbvoJ+jcdkrX3FIAVdwTLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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