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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46e6541f9270b858ae79c31acf96a68fe1e531cec72f391fb2760878e1cc0fa' 
  AND token = '3Y0EW5CjSbj+Gvt+OaF9P7Hhw+lajMMVdYNEhKUy5hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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