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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9889f08c9e542861a3a392ffeb15849a0eeb25c738c2370dd092892959e4ac3b' 
  AND token = 'Ra18EWUCLMGNUWOOfkhNOmchusUCjdEoz/T98XmpIG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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