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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a206f1de7a70d4ba534c8b6adc16d0b8c9a34b8527875507484ba42d99aea0c6' 
  AND token = 'vCQ5V/qLlaF4Chs40yAYZvBvF6TAmL5ONU9tvNyYVQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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