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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4757e523838d8ad10b03737b37409220add6611f9634682f920d73cbbd26c4e0' 
  AND token = 'gPBTqVCs8zLQyICHEUb4oEXSb8eELW082FG/IJT1Sro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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