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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d981ef6666ba26479dea8a8dee8f7bddab8e41b1d28cf83b919d8d71c19ad8' 
  AND token = 'nYB3Eek8lwLo932rznR8mKnZgy3iGRICKFCoixr+P1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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