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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4482db3c99f75eb3711df5e233fd8019135b0e1402704c00bcd706b0b408c7f3' 
  AND token = 'Vfv8YMB5cahFWOLn8e0dhZijIEkt3v6bubkR0qfYVq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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