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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7555815c537b5f25c3c1e48e2b743a0b480c219761ba7834ad7782be0c4f42dc' 
  AND token = '/mb7EK2HRpw+rK6m3xzSEajgYTArPwJq642A9II9xQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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