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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6350ccf14dcf1b406623fff38e367e114eb57b00aeb92f91f291dc3714fd3276' 
  AND token = 'YTg12If4ICWAs90T1gQFKdsu0/S0zOstBHiYotDBr8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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