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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc41243fba681a5a1a3ab5cc007becc5c39fa00081e78a67a07e1ae618803b8' 
  AND token = 'Od1pnWC11Vm/7ODmkjUI7ZgJyxfIT85a/DUaaCTBnc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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