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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17923aa7e52f61037584fd90f2396e411a82db4b42f2a3f8553a0c7a4e5e99a6' 
  AND token = '6UsUDdNQUoUjZZa63P+35wBE7H4ST0/eirUV60RPWeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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