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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de9c0999af908931d5aa67c5dc64e747d5ff28873bd81a5a667699b531d1d338' 
  AND token = 'q7kiFwU2rNi7QIAFJYfbEJwqMzLCgvHj005LN30eZNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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