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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf3151539786daf6d189830d741a017e5fac00fd1ce7e7c4bd96110d05f5656' 
  AND token = '6ENaeq50XVD0CuFOrOX1YTv1VOgfSo7fhr+qzYxGk88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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