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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922d5df84daef0ab76a8c7a64254ea64a2b7b412b4255a5886e4a19ac744dd73' 
  AND token = 'pMzogyoH/c7/5u86Z7pDmRn8p3xIYj4pk3CUHvKjG14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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