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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16ed3442b408a72327621c9beb1772bedccb2aabd5403b74237949a1d0f70ba5' 
  AND token = 'Cq92ytqmsRzwU/7/y8oPBb7XpbdyIk/W0/EkoKAwGMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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