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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876a6b5578d1f60c8c9e82370df7f1582d89676511990a8684d29310c3be3636' 
  AND token = 'eWp/cURJz+TWzrgfNz/ccF2joFDOfJ0iHRRLlEmwI9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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