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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94dd44576a42d7b0b72f25cce94a9cf6465d4640f69676823ae18869eda2bd24' 
  AND token = '95RDE2e6minGTAgajzMU4s132hrGHQVOJ+iIuovOrBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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