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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3072b51986bf73bd5b9a6cf92ab578064f40c104c58888072b012028bf99299' 
  AND token = 'RH+cPseXdIdS0h6lWk1pGidQovvyFucSlPZXP8USV30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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